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Standard solution: 3.6 µg/mL USP # RS in Mobile phase Sample solution: Equivalent to 1.2 mg/mL of # in Mobile phase from NLT 20 Tablets finely crushed. [NOTE¡ªSonicate if necessary, and centrifuge the solution before passing through a suitable filter. ] Calculate the percentage of each impurity in the portion of Tablets taken: Result = (rU/rS) ¡Á (CS/CU) ¡Á (1/F) ¡Á100 rU = peak response of each impurity from the Sample solution rS = peak response of # from the Standard solution CS = concentration of USP # RS in the Standard solution (mg/mL) CU = nominal concentration of # in the Sample solution (mg/mL) F = relative response factor as listed in Impurity Table 1 ÒÉÎÊ£ºÕâ¸ö¼ÆËã·½·¨µ½µ×ÊôÓÚÍâ±ê·¨£¬»¹ÊÇ×ÔÉí¶ÔÕÕ£¿ |
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